difference between substr ad substring

src/functions/closure.js

@@ -0,0 +1,26 @@
+var denver ={
+    name : 'Denver',
+    age : 12
+}
+
+var petitPied = {
+    name: 'Petit pied',
+    age : -6500000
+}
+
+function pure(a,b) {
+    //a.age= 15; NOT PURE
+
+    return a.age + b.age; //PURE : for somre input, will always return a value
+}
+
+console.log('pure :', pure(denver,petitPied));
+
+function unpure() {
+    //console.log ou screen() : will modify a stream
+    //capture the external petitPied object
+    //depends on external context, and not only params
+    console.log('kick', petitPied.name);
+    //a closure.js : to avoid
+}
+unpure;

src/functions/es5.js

@@ -0,0 +1,79 @@
+var topics = require('../data').topics;
+
+var result = topics.filter(function (topic) {
+    //reutrn true if we keep this topic
+    return topic.user.name === 'Leonard';
+});
+console.log("Leonard's comments", result);
+
+result = topics.filter(topic => topic.user.name === 'Leonard');
+console.log("Leonard's comments2", result);
+
+var titles = topics.map(function (topic) {
+    return topic.title;
+});
+console.log('titles', titles);
+
+titles = topics.map(topic => topic.title);
+console.log('titles', titles);
+
+console.log('##########');
+var hasViolence = topics.some(function (topic) {
+    return topic.tags.includes('violence')
+});
+console.log('has violence', hasViolence);
+
+console.log('##########');
+
+//1.topic titles where sheldon wrote at least one comment
+var filtered = topics.filter(function (topic) {
+    return topic.comments.some(function (comment) {
+        return comment.user.name === 'Sheldon';
+    });
+});
+console.log('number of filtered topics', filtered.length);
+
+
+var titles = filtered.map(function (topic) {
+    return topic.title;
+});
+
+
+//FAT ARROW
+
+titles = (topics.filter(topic=>topic.comments.some(comment =>comment.user.name === 'Sheldon'))).map(topic=>topic.title);
+console.log("Topics' names", titles);
+
+//2.Sorted id of Penny's comment
+var titlesId = [];
+topics.forEach(function (topic) {
+    topic.comments.forEach(function (comment) {
+        if (comment.user.name === 'Penny') {
+            titlesId.push(comment.id);
+        }
+    });
+});
+console.log('id', titlesId);
+
+var sortFunction = (a, b) => a < b ? -1 : 1;
+titlesId.sort(sortFunction);
+console.log("id sorted of Penny's comment", titlesId);
+
+//3.Contents of the comments written by a standard user, tagged 'violence'
+var filteredContent = [];
+topics.forEach(function (topic) {
+    topic.comments.forEach(function (comment) {
+        if (comment.tags !== undefined && !comment.user.admin) {
+            comment.tags.forEach(function (tag) {
+                if (tag === 'violence') {
+                    filteredContent.push(comment.content);
+                }
+            });
+        }
+        ;
+    });
+});
+console.log('violent contents', filteredContent);
+
+//4.search
+

src/functions/foreach.js

@@ -0,0 +1,17 @@
+var users = require('../data').users;
+
+users.forEach(function (user) {
+    console.log('user name', user.name);
+});
+
+console.log('#####');
+users.forEach(user => console.log('user name', user.name));
+//not very good, because there is not a result, or that's what we attend with a fat arrow
+
+var admins = [];
+users.forEach(function (user) {
+    if (user.admin === true){
+        admins.push(user.name);
+    }
+});
+console.log('admins', admins);

src/functions/formats.js

@@ -0,0 +1,16 @@
+
+console.log('2+3', add(2,3));
+
+//variable can't be under the consol.log
+var mult = function (a,b) {
+    return a*b;
+}
+console.log('4*3 :', mult(4,3));
+
+// function can be at the bottom
+function add(a,b) {
+    return a+b;
+}
+
+var divide =  (a,b) =>  a/b;
+console.log('6/3',divide(6,3));

src/functions/operations.js

@@ -0,0 +1,31 @@
+function add(a, b) {
+    return a + b;
+}
+console.log('2 +3 =', add(2, 3));
+
+function divide(a, b) {
+    return a / b;
+}
+console.log('6/3 =', divide(6, 3));
+
+function multiply(a, b) {
+    return a * b;
+}
+console.log('2*6 :', multiply(2, 6));
+
+
+function minus(a, b) {
+    return a - b;
+}
+console.log('6-3', minus(6, 3));
+
+
+function operation(op, x, y) {
+    return op(x, y);
+}
+console.log('multpiply', operation(multiply, 56, 59));
+
+
+var ops = [add, divide, multiply, minus];
+var random= ops[Math.floor(Math.random() * ops.length)];
+console.log('?', operation(random, 56, 59));

src/functions/sort.js

@@ -0,0 +1,24 @@
+var x = [2, 8, 6, 4, 32, 75, -3, 34, 15];
+
+var sortFunction = function (a, b) {
+    if (a === b) {
+        return 0;
+    }
+    return a < b ? -1 : 1;
+};
+
+console.log('array sorted', x.sort(sortFunction));
+
+var users = require('../data').users; //function require is link to node, very specific
+console.log('users',users);
+
+
+function sortUsers(user1, user2) {
+    if (user1.name === user2.name) {
+        return 0;
+    }
+    return user1.name<user2.name ? -1 : 1;
+    };
+    console.log('users sorted', users.sort(sortUsers));
+
+console.log("users's names", users.map(user =>user.name));

src/prototype/bind.js

@@ -0,0 +1,27 @@
+function Dinosaurus(name) {
+    this.size = 12;
+    this.name = name;
+}
+
+Dinosaurus.prototype.age = -65000000;
+
+const denver = new Dinosaurus('Denver');
+
+function Carnivore() {
+}
+Carnivore.prototype.eat = function(obj) {
+    console.log(this.name + ' eats ' + obj.name);
+};
+
+const tRex = new Carnivore();
+tRex.name = 'T Rex';
+
+//modification :
+const eating = tRex.eat;
+eating(tRex);
+
+boundToDenver=eating.bind(denver);
+console.log('bound eating to denver');
+boundToDenver(tRex);
+
+eating.bind(denver)(tRex);

src/prototype/priority.js

@@ -0,0 +1,18 @@
+function Dinosaurus(name) {
+    this.size = 12;
+    this.name = name;
+}
+
+Dinosaurus.prototype.age = -65000000;
+Dinosaurus.prototype.size = 20;
+
+const denver = new Dinosaurus('Denver');
+//new give access to a prototype
+
+const petitPied = new Dinosaurus('Petit Pied');
+
+console.log('denver size', denver.size);
+//console.log('denver prototype size', denver.prototype.size);//denver est un objet et un objet n'a pas de prototype.
+denver.size=150;
+console.log('new denver size :',denver.size);
+

src/prototype/prototype.js

@@ -0,0 +1,42 @@
+/**
+ * *Note that there is a Uppercase
+ * It's just a covnention
+ */
+
+
+function Dinosaurus(name) {
+    this.size = 12;
+    this.name = name;
+}
+
+Dinosaurus.prototype.age = -65000000;
+
+const denver = new Dinosaurus('Denver');
+//new give access to a prototype
+
+const petitPied = new Dinosaurus('Petit Pied');
+petitPied.size = 3;
+
+console.log("Denver's name :", denver.name);
+console.log('denver age :', denver.age);
+console.log('Petit Pied age :', petitPied.age);
+
+function TRex() {
+    this.name = 'Rex';
+}
+
+function Carnivore() {
+}
+Carnivore.prototype.eat = function (obj) {
+    console.log(this.name + ' eats ' + obj.name);
+}
+
+//TRex.prototype = Dinosaurus.prototype;
+//TRex.prototype = Carnivore.prototype;
+
+Object.assign(TRex.prototype,Dinosaurus.prototype);
+Object.assign(TRex.prototype,Carnivore.prototype);
+
+const rex = new TRex();
+ rex.eat(petitPied);
+

src/prototype/this.js

@@ -0,0 +1,26 @@
+function Dinosaurus(name) {
+    this.size = 12;
+    this.name = name;
+}
+
+Dinosaurus.prototype.age = -65000000;
+
+const denver = new Dinosaurus('Denver');
+
+function Carnivore() {
+}
+Carnivore.prototype.eat = function(obj) {
+    console.log(this.name + ' eats ' + obj.name);
+};
+
+const tRex = new Carnivore();
+tRex.eat(denver);
+
+tRex.name='T Rex';
+tRex.eat(denver);
+
+denver.eat = tRex.eat;
+denver.eat(tRex);//object this : denver
+
+const eating = tRex.eat;
+eating(denver);//object this : {}

src/start.html

@@ -8,34 +8,40 @@
 </head>
 <body>
 
-<h1> Hello Javascript</h1>
-
-<p> You are so nice !</p>
+<h1>Hello Javascript</h1>
+<p>You are so nice!</p>
 
 </body>
 
 <script type="text/javascript" src="http://underscorejs.org/underscore.js">
+    alert("Hello JS");
 </script>
 
 <script type="text/javascript">
-    var array = [2, 4, 6, 8, 10, 11, 0, -3];
+    var array = [2, 4, 6, 10, 11, 0, -3];
     var group = _.groupBy(array, function (num) {
         return num % 2
     });
     console.log(group);
     console.log(_.max(array));
-</script>
 
+</script>
 
 <script type="text/javascript">
-    var x=Number(prompt("Entrez un nombre positif :"));
-    var result=1;
-  function factoriel(x){
-    for(var i=1;i<=x;i++){
-        result=result*i;}
-    return result;
-   };
-    console.log('le factoriel de '+x+' est '+factoriel(x));
+
+    function factoriel(x) {
+        var result = 1;
+        for (var i = 1; i < x + 1; i++) {
+            result = result * i;
+        }
+        return result;
+    }
+
+    var result = factoriel(5);
+    console.log(result);
+
+    console.log('with function :', factoriel(250));
 </script>
 
+
 </html>

src/start.js

@@ -1,2 +1,2 @@
-var x=2+2;
+var x = 2+2;
 console.log(x);